Revenue Recognition Net Contract Assets( Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 3.3	$ 4.8
Contract with Customer, Asset, after Allowance for Credit Loss	0.0	2.5
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	$ (2.5)
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress, Percent	(100.00%)
Contract with Customer, Liability, Current	$ 8.4	13.0
Contract with Customer, Liability, Current, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized	$ 4.6
Contract with Customer, Liability, Current, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized, Percent	(35.40%)
Contract with Customer, Liability, Noncurrent	$ 5.9	5.9
Contract with Customer, Liability, Noncurrent, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized	$ 0.0
Contract with Customer, Liability, Noncurrent, Net, Change in Timeframe, Performance Obligation Satisfied Revenue Recognized, Percent	0.00%
Contract with Customer, Asset (Liability), Net	$ (14.3)	$ (16.4)
Contract with Customer, Asset (Liability), Change in Timeframe, Performance Obligation Satisfied Revenue Recognized	$ 2.1